车辆行至交叉路口，遇有转弯的车辆抢行，应（）。A.停车避让； B.保持正常车速行驶；

商业柜台出租，各种铺面出租和住房出租等都不包含着土地使用权的出租。()。

为了判断一个小铁球是不是空心的，小刚同学用天平和量筒测得如下数据：

若铁的密度ρ_铁=7.9×10³kg／m³，则：

（1）该小铁球是空心的还是实心的?请写出依据。

（2）若小铁球是空心的，空心部分的体积是多大?

阅读理解

    On Nov.18th,1908,three men went up in a balloon(气球).They started early in London. The

headman was Auguste Gaudron, and the other two men were Tannar and Maitland. They had a

big balloon and they were ready for a long way.

   Soon they heard the sea. They were carrying the usual rope(绳子),and it was hanging down

from the basket of the balloon. At the end of the rope they had tied a metal box. This could hold

water, or it could be empty. So they were able to change its weight(重量).It was for use over the

sea. They were also carrying some bags of sand.

   After the sun rose, the balloon went higher. It went up to 3,000 metes, and the air was very cold.

The water in the balloon became ice. Snow fell past the men's basket, and they could see more snow

on the ground. The men tried to throw out some more sand; but it was hard. They tried to break the

icy sand with their knives, but it was not easy. The work was slow and they were still falling, so they

had to drop some whole bags of sand. One of them fell on an icy lake and made a black hole in the ice.

   At last they pulled the box into the basket. It was still snowing; so they climbed to get away from

the snow. They rose to 5,100 metes! Everything became icy. They were so cold that they decided to

land. They came down in Poland heavily but safely. They had traveled 1,797 kilometers from London!

1.Three men flew in balloon ________.

A. for nearly 1,800 kilometers              

B. to another city

C. to visit Poland                        

D. more than a century ago

2.The metal box was used for ________.

A. carrying the bags of sand' '              

B. keeping drinking-water

C. carrying ropes of the basket            

D. changing weight

3.When the balloon went up higher,________.

A. the temperature of the balloon began to fall        

B. They saw the sun go down

C. They made a hole in the basket with their knives

D. They could see a black hole on the ground

4.The balloon landed ________.

A. in London    

B. on the sea    

C. on a lake    

D. in a foreign country

5.Which of the following is NOT true ________

A  The three men started their journey before the sun rose.

B.  The balloon began to go up when they threw bags of sand out of the basket.

C.  When they pulled the box into the basket, the balloon began to climb up.

D.  The three men had to land because they felt cold.

利用______可以对软件的技术信息、经营信息提供保护。

A．著作权
B．专利权
C．商业秘密权
D．商标权

家用、固定安装电器，移动式电器，携带式电器以及临时用电设备漏电动作电流值小于或等于（）mA。

A.6

B.10

C.15

D.30